# Essential Heating Services Limited > Browser-based paperwork software for UK gas and heating engineers, with company-branded A4 certificates, quotes and invoices. ## Product and access A free account saves supported drafts and calculator results. Issuing numbered customer documents and downloading the relevant PDFs/reports requires the paid package or a legitimate existing access grant. 22 current record types across Natural gas, LPG, Unvented hot water, Renewable heating. Public sample PDFs contain fictional data and sample markings. They are examples, not customer records. ## Free tools - [Gas rate calculator](https://essentialheatingservices.co.uk/gas-rate-calculator): Free on-screen calculations without an account. Results are temporary on the current page; they are not saved to an account and do not generate a PDF. - [Independent IGEM/UP/1B Calculator](https://calculator.essentialheatingservices.co.uk/): Free on-screen calculations; a free account can save supported results. Relevant PDF/report downloads require Essential or an applicable existing access grant. - [Gas pipe and installation volume](https://calculator.essentialheatingservices.co.uk/gas-pipe-volume-calculator): Public information and a route to the existing installation-volume tool; this is not a pipe-sizing tool. ## Subscription £24.99/month or £269.89 upfront for 12 months, including up to 2 engineers. Additional engineers: £9.99/month or £107.89 upfront per year each. Introductory base prices until 31 December 2026. Subscribe before 1 January and keep your introductory base price for as long as your subscription stays active. From 1 January 2027, new base packages cost £31.24/month or £337.36 upfront for 12 months — a 25% increase, rounded to the nearest penny. Additional engineers remain £9.99/month or £107.89/year each. Checkout shows the amount payable and any applicable tax information. ESSENTIAL30: 30% off the first qualifying monthly or annual subscription payment for new customers, once per customer, until 31 December 2026. Later payments use the applicable subscription rate. See https://essentialheatingservices.co.uk/offers.html. ## Public pages - [Gas Engineer Software: Certificates, Quotes & Invoices | Essential](https://essentialheatingservices.co.uk/) - [Privacy Policy | Essential Heating Services Limited](https://essentialheatingservices.co.uk/privacy) - [Subscription Terms | Essential Heating Services Limited](https://essentialheatingservices.co.uk/terms) - [Essential subscription offer and conditions](https://essentialheatingservices.co.uk/offers.html) - [Free Gas Rate Calculator | Metric & Imperial | Essential](https://essentialheatingservices.co.uk/gas-rate-calculator) - [Gas Engineer Quote & Invoice Examples | Sample PDFs | Essential](https://essentialheatingservices.co.uk/document-samples) - [Sample Gas & Heating Certificates and PDF Records | Essential](https://essentialheatingservices.co.uk/certificate-samples) - [About Essential Heating Services Software | Certificates & Paperwork](https://essentialheatingservices.co.uk/about) - [Essential Software Support | Accounts, Certificates & Invoices](https://essentialheatingservices.co.uk/contact) - [Gas Certificate Software & Safety Record App | Essential](https://essentialheatingservices.co.uk/gas-safety-certificate-software) - [CP12 Certificate Software & Landlord Gas Safety Records | Essential](https://essentialheatingservices.co.uk/landlord-gas-safety-records) - [IGEM/UP/1B Gas Tightness Test Records & PDF Reports | Essential](https://essentialheatingservices.co.uk/gas-tightness-test-records) - [Boiler Service Record Software & Gas Appliance PDFs | Essential](https://essentialheatingservices.co.uk/boiler-service-record-software) - [Gas Warning Notice Software & PDF Samples | Essential](https://essentialheatingservices.co.uk/gas-warning-notice-software) - [LPG Gas Certificate Software & Safety Record PDFs | Essential](https://essentialheatingservices.co.uk/lpg-gas-certificate-software) - [Mobile Catering Gas Certificate Software | Essential](https://essentialheatingservices.co.uk/mobile-catering-gas-record-software) - [Caravan Gas Safety Record Software & LPG Samples | Essential](https://essentialheatingservices.co.uk/caravan-gas-safety-record-software) - [Unvented Cylinder Service & Commissioning Records | Essential](https://essentialheatingservices.co.uk/unvented-cylinder-record-software) - [Heat Pump Service Record Software & ASHP PDF | Essential](https://essentialheatingservices.co.uk/heat-pump-service-record-software) - [Solar Thermal Service & Commissioning Record Software | Essential](https://essentialheatingservices.co.uk/solar-thermal-record-software) - [Commercial Gas Record Software & Catering PDFs | Essential](https://essentialheatingservices.co.uk/commercial-gas-certificate-software) - [Gas Installation & Commissioning Record Software | Essential](https://essentialheatingservices.co.uk/gas-commissioning-record-software) - [Gas Access Attempt Record & No Access PDF Sample | Essential](https://essentialheatingservices.co.uk/gas-access-attempt-record) - [Gas Engineer Invoice Software & Branded PDFs | Essential](https://essentialheatingservices.co.uk/gas-engineer-invoice-software) - [Gas Engineer Quoting Software & Quote PDFs | Essential](https://essentialheatingservices.co.uk/gas-engineer-quoting-software) - [Gas Engineer Software Pricing & Engineer Allowances | Essential](https://essentialheatingservices.co.uk/pricing) - [Create Your First Gas Certificate in Essential | Essential](https://essentialheatingservices.co.uk/guides/create-first-gas-certificate) - [How to Create a Gas Engineer Quote | Essential](https://essentialheatingservices.co.uk/guides/create-a-quote) - [How to Create a Gas Engineer Invoice | Essential](https://essentialheatingservices.co.uk/guides/create-an-invoice) - [Add Company Branding & Engineer Details | Essential](https://essentialheatingservices.co.uk/guides/company-branding-and-engineers) - [Choosing Gas Certificate Software: UK Buying Guide | Essential](https://essentialheatingservices.co.uk/gas-certificate-software-comparison) ## Practical guides - [Create a first certificate](https://essentialheatingservices.co.uk/guides/create-first-gas-certificate) - [Create a quote](https://essentialheatingservices.co.uk/guides/create-a-quote) - [Create an invoice](https://essentialheatingservices.co.uk/guides/create-an-invoice) - [Add company branding and engineer details](https://essentialheatingservices.co.uk/guides/company-branding-and-engineers) ## Identity and support Company number 13003130. [Companies House](https://find-and-update.company-information.service.gov.uk/company/13003130). [Contact support](https://essentialheatingservices.co.uk/contact): support@essentialheatingservices.co.uk. ## Scope and limitations - Original work records do not replace required manufacturer or scheme documentation. - Essential is independent and is not endorsed by IGEM. - Oil records and ASHP commissioning are not offered. - No native mobile app, offline certificate workflow, accounting integration or customer payment collection is advertised. This public information contains no customer documents, account data, signatures, credentials or subscription status. Account actions and document workflows require the existing authenticated application. Public HTML pages also support Accept: text/markdown. They retain their original canonical URLs. Private application pages and APIs are excluded.